dsp启动过程理解..docVIP

上电复位reset 0x3fffc0，内容是initboot （bootrom 程序） 参见init_boot.asm文件 入口： _InitBoot: ; Initalize the stack pointer. __stack: .usect .stack,0 MOV SP, #__stack ; Initalize the stack pointer ; Initalize the device for running in C28x mode. C28OBJ ; Select C28x object mode C28ADDR ; Select C27x/C28x addressing C28MAP ; Set blocks M0/M1 for C28x mode CLRC PAGE0 ; Always use stack addressing mode MOVW DP,#0 ; Initialize DP to point to the low 64 K CLRC OVM ; Set PM shift of 0 SPM 0 ; Decide which boot mode to use LCR _SelectBootMode ; Cleanup and exit. At this point the EntryAddr ; is located in the ACC register BF _ExitBoot,UNC 出口函数： _ExitBoot: ; ; Insure that the stack is deallocated ; MOV SP,#__stack ; ; Clear the bottom of the stack. This will endup ; in RPC when we are finished ; MOV *SP++,#0 MOV *SP++,#0 ; ; Load RPC with the entry point as determined ; by the boot mode. This address will be returned ; in the ACC register. ; PUSH ACC POP RPC ; ; Put registers back in their reset state. ; ; Clear all the XARn, ACC, XT, and P and DP ; registers ; ; NOTE: Leave the device in C28x operating mode ; (OBJMODE = 1, AMODE = 0 ; ZAPA MOVL XT,ACC MOVZ AR0,AL MOVZ AR1,AL MOVZ AR2,AL MOVZ AR3,AL MOVZ AR4,AL MOVZ AR5,AL MOVZ AR6,AL MOVZ AR7,AL MOVW DP, #0 ; ; Restore ST0 and ST1. Note OBJMODE is ; the only bit not restored to its reset state. ; OBJMODE is left set for C28x object operating ; mode. ; ; ST0 = 0x0000 ST1 = 0x0A0B ; 15:10 OVC = 0 15:13 ARP = 0 ; 9: 7 PM = 0 12 XF = 0 ; 6 V = 0 11 M0M1MAP = 1 ; 5 N = 0 10 reserved ; 4 Z = 0 9 OBJMODE = 1 ; 3 C = 0 8 AMODE = 0 ; 2 TC = 0 7 IDLESTAT = 0 ; 1 OVM = 0 6 EALLOW = 0 ; 0 SXM = 0 5 LOOP = 0 ; 4 SPA = 0 ; 3 VMAP = 1 ; 2 PAGE0 = 0 ; 1 DBGM = 1 ; 0 INTM = 1 ; MOV *SP++,#0 MOV *SP++,#0x0A0B POP ST1 POP ST0 ; ; Jump to the EntryAddr as defined by the ; boot mode selected and continue execution ; LRETR ;eof initboot 选择上电引导方式 分别跳到入口地址 280x_boot.h #define FLASH_ENTRY_POINT 0x3F7FF6 #define OTP_ENTRY_POINT 0x3D7800 #define RAM_ENTRY_POINT 0x0